Electric switch



Sept. 30, 1930. s. A. BURNHAM ELECTRIC SII'I'CH Filed April 14. 1926 2Shuts-Shoot 2 Qu M Patented Sept. 30, 1930 (moms; 3111mm, or sevens,imss'acnusm-rs; na'srear'on fo eommmmn MANU FACTUBINGCORPORATIUN',OFSOU'I'H' 0F ELSSICHUSETTS Animation ma April-14,

This invention relates to oilimmersql high tension electric switches; vi

The terminals of an electric'switeh must have sufl'lcient spacing toprevent-flash-ov ers between thmmand where'air is the insulating,medium, the terminals must necessarily be spaced widely apart toprovide 'suificient' In; sulation, ii high voltaiges are employed Toprovide the requisite spaeing with vertically disposed illstlhtiflgbushings wouldnews sit-ate switch ming d-prohibitive: size; so it hasbeen-oommonpmctie'e torobtainthe desired spacingat the terminal end-0fthe bushingby-inchning the bushings outwardly; This construction; anincreased spacing? at the' topof' the insulator, must necessarilydecrease-the spwingzaat the lower end of the insnlator; i To aicertainextent this'may he pemnissib'le since'the lower exposed terminals of'theinsulatorfare im'e in oil; but it isevident that ifthe:

bnshings are. inclined to any great extent, the lateral: dimensions ofthe'switch' casing. must beincreasedto maintaina safe-'spacingof thelower terminals.

An object of thisinvention is the provision 'of anelectrie'switchrandzinsuletingtbnshings iorthe switch studs somanged'that a relatively wide spacing 6025 the exposed terminals o fithestuds :is vpncw ided-with a switehcesing of moderate dimensions.

A further object is generally to improve the construetim of electric'swit'ches'andfsimilar' tus.

7 Certain features herean described are: described and'claimted in myco-pendingrapolications' Serial No; 729,'685,yfiled-:A g =-1, i924;all-dismay -102,069,- fil0d April 14, 1926.

Fig: l'is a seotionul ele'mtiencoi melectsic switch embodying theinvention,

-. Fig. 2is' a sectionsl selewitionthnongh. an insulatingbushingtoi-Fig. 11; Y

Fig; 32 is a: sectie'mala-elevilti'on-of a modified form of electricswitch embodying the'invention;

I The electric switch iiimmmi 'Fig'. 11ineludes an enclosingcaaihgicompriaingithe oil -recepttacle 10- and thvswitchframe-12 whichforms a cowerfo'r seid 'mceptacle." Said shame and insuiater japproxiim/tely ms; sum in; lama-n.-

m mssw Summon ow ELECTRIC swn'cn is provided with. a top wan'wmeh'hastwdV,

downwerdly inclined opposed sections 1-4: and 16 each formed with an"aperture therethroughw Amechanism well 18,is earried by theswitch-frameunder the top wallnnd'abo ut in theyert'icalline of the casing, andsuitable operatings neohsnism QOiscontained therein;

A movable switch member 22 is connected ithsaid-mechenism and dependstherebelewl and is provided at its lower end with a bent metal tube 28so shaped as to rovide an approximately vertical lower section 3O an'dan outwardly imlined. upper section which is appnoximately perpendicularwith an in;

'clined section of the top wall of -the switch aperframe. I Said tubeextemk through the ture in said inclined section depends therebelowend-is provided with ontstand flange its upper endwhieh covers saidaperture; and; is secured to said wall'b boltsifi A tubular "insulatin-hod orshe :isdisposedon the-upperend 0% mi tube and in linewith-thecpening therein andhes a clamping flange; 38 at-itslower'endwbicliis seemedto- 881d fiange 34 46. .As time arranged, saidinsulator-shell isextendupward 'and; at an angle outwaralk-awaly the eltioalmsis of the *said shell may be provided with snitab e--pettia mpssa'i s u smmh eh insulater thus described is .tretednwre-partieulaml?in;Eig, QQaee m risingg mcondletorfiw ichextendsikmngh v ss ytherewith-and is-conneetedtesaid contact 'WandMnpperterminaQnember-of-the is; vertically disposedl within theconductor-structure is formed from asection of commercial high tensioncable and shaped as above described and as set forth more specificallyin my above-named "copending ap-' plications. 4 r V I g By the provisionof the insulators above described, the lower ends thereof may bevertical and relatively closely spaced under the oil,'so' that thecasing may be ofmoderate diameter, whilepreserving adequate insulationbetween the casing and conducting com'po nents'of the switch. At thesame time the ex posed insulator terminals may be widely spaced in airand'thus may be well insulated against flashovers therebetween. r

; The'oil level in the casing is adapted to be somewhat above the lowerends of the metal tubes of the insulators whereby to prevent coronathereat. i In the switch, illustrated in Fig. 3 the switch frame ismodifiedtotake the place of the metal tubes of Figs. 1 and 2. Asillustrated in this "figure the switch frame 12 is formed withthehorizontalbottoniwall 60 and the top wall 62 which is spaced abovesaid bottom wall and is provided with the opposed anddownwardly-inclined Wall-section '64 and 66. The walls 68 of a'mechanismwell 7 0 connectthetop and bottom walls and divide the space therebet'ween into two compartments 7 2 and .74, each of which is equivalent tothe metal tubeof Figs. 1 and 2. Insulators 76 and; '7 8 are carried bysaid top and bottom walls, respectively, and conductor -structures 80extend through said insulators and the compartments 7 2 and 74-fand' areconnected with terminal-connectors 82 at the tops of said insulators? 6and withcontact blocks 84 at the bottoms ofsaid insulators 7 8 Theconstruction may be otherwise modified without departing from the spiritof the invention.

1. In an electr calapparatus, the 'combination of an enclosingcasng,approx1mately vertical insulator-bodies carried by and dependingw1th1n-sa1d casing, companion insulator-bodies carried by said casingand extended upwardly and outwardly therefrom in' angular relationto-saidfirst insulatorbodies, terminal connectors carried by the lowerends of said first insulator-bodies, and bent continuous conductorsextended the communicating passages insaidinsulator-bodies and havingaconnection with said terminal connector. r 3. AnBlBCtIlC'SWltChcomprising the combination with an enclosing casing of apair of insulator bushings having theirexposed portions extendingupwardly from the easing in diverging relation, each bushing'connprising an approximatelyevertical insulatorbody carried by and dependingwithin said casing, a second; insulator-body carried by sald casing andextended outwardly there froni'at an angle with said firstinsulatorbody, and a continuous conductor extended through bothinsulator-bodies.

4. An electric switch comprising the com-' bination with an enclosingcasing of a pair of insulator bushings having their exposed portionsextending upwardly from the casing in diverging relation, each bushingcomprising an approximately-verticalinsulatorbody carried byanddepending within said casing, a second insulator-body carried by saidcasing and extended outwardly therefrom at an angle with saidfirs'tinsulator-1.

body, a contact member carried by the lower end of said firstinsulator-body, a movable switch member cooperating with saidicon- 'tactmember, and a bent continuous conductor extended through bothinsulator-bodies and having a connection with said contact member. i

i 5. Anelectric switch comprising the combination ofan enclosing casing,a pair of -insu'lating'bushings extended through said -cas1ng,saidbushings having approximately vertical and parallel lower:insulating sections and divergent upper insulatingl sections, and switchmechanism disposed abetwe'enisaid bushings aboveithe vertical sec tionsthereof. v p I 6. An electrical apparatus having the combination of'anenclosing casing and a pairpf insulated terminals therefor, each'termi'nal' comprising a bent tube extended i throughsaid casing andhaving an approxi :mately vertical lower section and an upper sectionwhich is inclined away from the ver- 'ti'c'al lower section, aninsulator-body atltached-to' and depending from'the end ofi.

said vertical section in line therewith, a terminal connector carried bysaid insulator body at its lower end, a second insulatorbody attached tothe end of said upper inclined section and extended upwardly therefromand above the casing and at an inclination from the vertical and a bentconductor extended through said tube and insulator-bodies and having aconnection with said terminal-member.

7 An electric switch having the combination with an oil-containingcasing of a pair of insulator bushings having their exposed portionsextending from the casing in diverging relation, each bushing comprisinga bent tube carried by said casing and having a lower vertical sectionwhich extends below the oil level in said casing and an u per sectionwhich is inclined away from tlie vertithrough said metal andinsulator-shells and having a connection with said contact member, amovable switch member cooperating with said contact member, andsupporting means for said bushing having a connection with said metalshell and with said casing.

In testimony whereof, I have signed my name to this s ecification.

EORGE A. BURNHAM.

cal, an insulator-shell attached to the end of and depending below andin line with said vertical section, a contact member carried by thelower end of said tube, a second insulatorbody attached to the end ofand extended upwardly beyond said inclined section at an inclinationwith said casing, a bent conductor extended through said tube and saidinsulator-bodies and having a connection with said contact member, and amovable switch member cooperating with said contact member.

8. An electric switch having the combination with an oil-containingcasing of a pair of insulator bushings having their exposed portionsextending from the casing in diverging relation, each bushing comprisinga bent tube carried by and disposed mainly within said casing, said tubehaving an approximately Vertical lower section and an upper sectionwhich is inclined away from the vertical, an insulator-body attached tothe end of and depending below said vertical section and in linetherewith, a contact member carried by the lower end of saidinsulator-body, a second insulator body connected with the end of saidinclined section and extended outwardly in line therewith and upwardlyabove and at an inclination with said casing, a bent conductor extendedthrough said metal tube and insulator-bodies and having a connectionwith said contact member, and a movable switch member cooperating withsaid contact member.

9. An electric switch comprising an oil casing having a pair of switchterminals, each terminal comprisin an insulating bushing having ametal,she 1 provided with an approximately vertical lower section and anupper section which is inclined away from the vertical, aninsulator-shell attached to the end of and depending from said verticallower section, a contact member carried by the lower end of saidinsulator-shell, a second insulator shell attached to the end of andextended upwardly from and in line with said upper section, a bentconductor extended

